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Possibly correct variable EXTRACT_I16.

This commit is contained in:
Ben Vanik 2014-06-10 21:38:33 -07:00
parent 02709e0d65
commit 45e149d00b
1 changed files with 7 additions and 8 deletions
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15
src/alloy/backend/x64/x64_sequences.cc
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@ -4393,14 +4393,13 @@ EMITTER(EXTRACT_I16, MATCH(I<OPCODE_EXTRACT, I16<>, V128<>, I8<>>)) {
e.vpextrw(i.dest.reg().cvt32(), i.src1, VEC128_W(i.src2.constant()));
} else {
// TODO(benvanik): try out hlide's version:
// e.mov(e.eax, 7);
// e.and(e.al, i.src2); // eax = [i&7, 0, 0, 0]
// e.imul(e.eax, 0x00000202); // [(i&7)*2, (i&7)*2, 0, 0]
// e.xor(e.eax, 0x80800203); // [((i&7)*2)^3, ((i&7)*2)^2, 0x80, 0x80]
// e.vmovd(e.xmm0, e.eax);
// e.vpshufb(e.xmm0, i.src1, e.xmm0);
// e.vmovd(i.dest.reg().cvt32(), e.xmm0);
XEASSERTALWAYS();
e.mov(e.al, i.src2);
e.xor(e.al, 0x1);
e.mov(e.ah, e.al);
e.add(e.ah, 1);
e.vmovd(e.xmm0, e.eax);
e.vpshufb(e.xmm0, i.src1, e.xmm0);
e.vmovd(i.dest.reg().cvt32(), e.xmm0);
}
}
};